CN220600795U

CN220600795U - Expansion device for valve rod type expansion compensation

Info

Publication number: CN220600795U
Application number: CN202322251400.7U
Authority: CN
Inventors: 李长鸿; 赵金虎; 薛维法
Original assignee: BEIJING XINGDA BELLOWS CO LTD
Current assignee: BEIJING XINGDA BELLOWS CO LTD
Priority date: 2023-08-21
Filing date: 2023-08-21
Publication date: 2024-03-15
Anticipated expiration: 2033-08-21

Abstract

The utility model discloses a valve rod type expansion compensation expansion device, which relates to the technical field of corrugated expansion devices and comprises a sealing valve core, a valve cover and an expansion device, wherein the expansion device is provided with a first corrugated pipe, a first guide joint, a second corrugated pipe, a second guide joint and a third corrugated pipe from bottom to top, all of which are made of metal stainless steel materials, are mutually welded and connected, and are connected in series to form a series wave, the lower end of the first corrugated pipe is welded with a lower connecting pipe, the upper end of the third corrugated pipe is welded with an inner cavity of an upper connecting pipe expansion device, the lower end of the valve rod passes through the lower connecting pipe and is spirally connected with the sealing valve core, and a plurality of threaded holes are formed in the upper connecting pipe and are in sealing connection with the valve cover through bolts and nuts. Compared with the prior art, the telescopic valve has the advantages that the metal corrugated pipes are adopted, the thin-wall layers are adopted, the rigidity and the flexibility of the telescopic device are improved, the stroke of the valve rod is effectively increased due to the fact that the corrugated pipes are connected in series, and the service life of the telescopic device is prolonged.

Description

Expansion device for valve rod type expansion compensation

Technical Field

The utility model relates to the technical field of ripple compensators, in particular to a valve rod type telescopic compensating telescopic device.

Background

The prior art generally adopts rubber as a flexible element in the pipeline systems or pipe networks of metallurgy, petroleum, chemical industry, hot spot, heating, water supply, coal gas and the like, but the rubber is very sensitive to temperature, is easy to age, has short use time, and therefore needs to adopt the corrugated compensator made of metal when the service life is long, but the metal corrugated pipe is limited by the height of a mould and a machine tool, all waves cannot be molded at one time, and has short stroke, thus the corrugated compensator with long service life and large stroke is needed, and therefore, the valve rod type expansion compensation expansion device is disclosed to meet the demands.

Disclosure of Invention

The present utility model is directed to a valve rod type telescopic compensation telescopic device, so as to solve the problems set forth in the above-mentioned background art.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides a telescopic compensator of valve rod formula compensation, includes sealed case, valve gap and expansion bend, the expansion bend is from upwards having first bellows, first direction joint, second bellows, second direction joint and third bellows down, all adopts metal stainless steel material, and mutual welded connection between each other, and the cluster is in the same place to form the cluster ripples, first bellows lower extreme welding has down takeover, the upper end welding of third bellows has last takeover the inner chamber of expansion bend is equipped with the valve rod, the lower extreme of valve rod pass down takeover with sealed case screwed connection, go up be equipped with a plurality of screw holes on the takeover with the valve gap passes through bolt and nut sealing connection.

Preferably, sliding rails are arranged on the inner sides of the first guide connector and the second guide connector, and sliding blocks matched with the sliding rails are arranged at the middle ends of the valve rods.

Preferably, the middle ends of the first guide joint and the second guide joint adopt round arc structures.

Preferably, the first corrugated pipe, the second corrugated pipe and the third corrugated pipe all adopt thin-wall multilayer structures.

Preferably, a packing area is arranged in the valve cover to prevent the medium from flowing out of the valve rod.

The utility model has the technical effects and advantages that:

the utility model has reasonable structure, the welding port of the corrugated pipe adopts a hydraulic forming process by self in a squeeze wave fusion welding mode, and the shape is sufficiently corrected, so that in the expansion process of the expansion device, all waveform changes are uniform and consistent, when the valve rod moves up and down along the valve cover, the valve rod passes through the lower connecting pipe to be spirally connected with the sealing valve core, and the lower connecting pipe is welded with the lower end of the first corrugated pipe, so that the first corrugated pipe, the first guide joint, the second corrugated pipe, the second guide joint and the third corrugated pipe are driven to be mutually welded and strung together to form a serial wave integral expansion, the stroke of the corrugated compensator is increased, and the service life of the compensator is effectively prolonged by adopting the metal corrugated pipe.

According to the utility model, the sliding rails are arranged on the inner sides of the first guide joint and the second guide joint, the sliding blocks matched with the sliding rails are arranged at the middle ends of the valve rods, the valve rods are guided and stabilized, the middle ends of the first guide joint and the second guide joint are in round arc-shaped structures, the phenomenon of shell clamping during expansion and contraction of the corrugated pipes is avoided, the first corrugated pipe, the second corrugated pipe and the third corrugated pipe are all in thin-wall multilayer structures, the overall axial rigidity and radial bending stress are reduced, the flexibility is increased, and the service life of the compensator is prolonged.

Drawings

FIG. 1 is a schematic perspective view of the present utility model;

FIG. 2 is a schematic view of a three-dimensional cross-sectional structure of the present utility model;

FIG. 3 is a schematic top view of the guide adapter and valve stem of the present utility model.

In the figure: 1. sealing the valve core; 2. a first bellows; 3. a first guide joint; 4. a second bellows; 5. a second guide joint; 6. a third bellows; 7. a lower connecting pipe; 8. an upper connecting pipe; 9. a valve cover; 10. a valve stem; 11. a slide block; 12. a slide rail.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The utility model provides a valve rod type expansion compensation expansion device shown in figures 1-3, which comprises a sealing valve core 1, a valve cover 9 and an expansion device, wherein the expansion device is provided with a first corrugated pipe 2, a first guide joint 3, a second corrugated pipe 4, a second guide joint 5 and a third corrugated pipe 6 from bottom to top, all are made of metal stainless steel materials, and are mutually welded and connected with each other to form a serial wave, the lower end of the first corrugated pipe 2 is welded with a lower connecting pipe 7, the upper end of the third corrugated pipe 6 is welded with an upper connecting pipe 8, the inner cavity of the expansion device is provided with a valve rod 10, the lower end of the valve rod 10 passes through the lower connecting pipe 7 and is in spiral connection with the sealing valve core 1, a plurality of threaded holes are arranged on the upper connecting pipe 8 and are in sealing connection with the valve cover 9 through bolts and nuts, a corrugated pipe welding port is in a squeezing wave fusion welding mode, a hydraulic forming process is adopted by the expansion device, and the expansion device is fully calibrated, all wave changes are uniform and consistent in the expansion process, when the valve rod 10 moves up and down along the valve cover 9, the lower connecting pipe 7 passes through the lower connecting pipe 7 and the first corrugated pipe 2, the lower connecting pipe 2 and the first corrugated pipe 4 are welded with the expansion device, the first corrugated pipe 4 and the expansion device are integrally connected with the expansion device, and the expansion device are welded with the first corrugated pipe and the expansion device and the corrugated pipe 4 and the expansion device are in a whole.

Further, in this embodiment, the inner sides of the first guide joint 3 and the second guide joint 5 are provided with a slide rail 12, and the middle end of the valve rod 10 is provided with a slide block 11 engaged with the slide rail 12 to guide and stabilize the valve rod 10.

Further, in this embodiment, the middle ends of the first guide connector 3 and the second guide connector 5 adopt a round arc structure, so as to avoid the shell blocking phenomenon when the bellows stretches out and draws back.

Further, in this embodiment, the first bellows 2, the second bellows 4 and the third bellows 6 all adopt thin-wall multi-layer structures, which reduces the overall axial rigidity and radial bending stress, increases flexibility, and improves the service life of the compensator.

The working principle of the utility model is as follows: when the valve rod 10 moves up and down along the valve cover 9, the valve rod is in spiral connection with the sealing valve core 1 through the lower connecting pipe 7, and the lower connecting pipe 7 is welded with the lower end of the first corrugated pipe 2, so that the valve rod is driven, and the first corrugated pipe 2, the first guide joint 3, the second corrugated pipe 4, the second guide joint 5 and the third corrugated pipe 6 are mutually welded and strung together to form a serial wave integral expansion and contraction, and the stroke of the corrugated compensator is increased.

Finally, it should be noted that: the foregoing description is only illustrative of the preferred embodiments of the present utility model, and although the present utility model has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements or changes may be made without departing from the spirit and principles of the present utility model.

Claims

1. The utility model provides a telescopic device of flexible compensation of valve rod formula, includes sealed case (1), valve gap (9) and telescopic device, its characterized in that: the expansion joint is from down upwards having first bellows (2), first direction joint (3), second bellows (4), second direction joint (5) and third bellows (6), all adopt metal stainless steel material, mutual welded connection between each other, and the cluster is in the same place to form the cluster ripples, first bellows (2) lower extreme welding has down takeover (7), the upper end welding of third bellows (6) has last takeover (8) the inner chamber of expansion joint is equipped with valve rod (10), the lower extreme of valve rod (10) pass down takeover (7) with sealed case (1) screwed connection, go up be equipped with on takeover (8) a plurality of screw holes with valve gap (9) pass through bolt and nut sealing connection.

2. A valve stem type telescopic compensating telescopic device according to claim 1, wherein: the inner sides of the first guide joint (3) and the second guide joint (5) are provided with sliding rails (12), and the middle end of the valve rod (10) is provided with sliding blocks (11) matched with the sliding rails (12).

3. A valve stem type telescopic compensating telescopic device according to claim 2, wherein: the middle ends of the first guide joint (3) and the second guide joint (5) adopt round arc structures.

4. A valve stem type telescopic compensating telescopic device according to claim 1, wherein: the first corrugated pipe (2), the second corrugated pipe (4) and the third corrugated pipe (6) are all of thin-wall multilayer structures.

5. A valve stem type telescopic compensating telescopic device according to claim 1, wherein: a packing area is arranged in the valve cover (9) to prevent the medium from flowing out of the valve rod.